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Processor Thermal Test Fixture

Publishing Venue

IBM

Abstract

Disclosed is a device for securing a temperature control device to a microprocessor or ASIC under test. Benefits include consistent and repeatable test results resulting from consistent and coplanar contact between the temperature control device and the device under test (DUT). The disclosed test fixture consists of a toggle clamp with an adjustable spring loaded piston that applies a force down through the temperature control assembly onto the DUT. The downward force secures the temperature control assembly in place and helps create a coplanar junction.

Country

Undisclosed

Language

English (United States)

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Processor Thermal Test Fixture

Placing a temperature control assembly atop a DUT to control the temperature leads to several test issues. The main problem is a poor thermal connection at the junction between the temperature control assembly and the DUT. A non-coplanar junction results in inconsistent and unrepeatable test results. In extreme cases, the assembly tilts over causing contact between the DUT and temperature control assembly to be completely broken. A typical temperature control assembly may consist of a cold sink with thermocouple, a thermoelectric cooler (TEC), and a heat sink.

The disclosed test fixture consists of a toggle clamp with an adjustable spring loaded piston that applies a force down through the temperature control assembly onto the DUT. The downward force secures the temperature control assembly in place and helps create a coplanar junction.

The disclosed thermal test fixture (see Figure) is an off-the-shelf woodworking toggle clamp modified with a spring loaded piston. The chosen spring provides the correct amount of force directly through the temperature control assembly to the DUT. The clamp forces the surfaces of the DUT and the temperature control assembly to remain coplanar. A mounting bracket holds the clamp in place. The mounting bracket adjusts with six degrees of freedom to center the piston over the DUT.

Modification to the woodworking toggle-clamp (Fig Ref 1) involves removing the off-the-shelf plunger from the arm of the clamp. The plunger is the piece that typically delivers pressure to the clamped item. A threaded column (Fig Ref 2) replaces the plunger. Hex nuts (Fig Ref 3) positioned on either side of the clamp arm hold the th...